Sen. Mark UdallMark UdallPicking 2018 candidates pits McConnell vs. GOP groups Gorsuch's critics, running out of arguments, falsely scream 'sexist' Election autopsy: Latinos favored Clinton more than exit polls showed MORE (D-Colo.) turned down an invitation to join Sen. Rand PaulRand PaulGOP leader tempers ObamaCare expectations Senate gears up for fight on Trump's 0B Saudi Arabia arms sale Paul: 0B Saudi arms deal ‘a travesty’ MORE’s (R-Ky.) lawsuit challenging a National Security Agency program. 

A spokesman for Udall late Wednesday said the Colorado senator was approached by Paul’s camp, but never joined the lawsuit.

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“Sen. Paul’s team approached our office, but Sen. Udall is focused on his bipartisan and bicameral legislation — with Sen. Paul and others — to rein in the NSA and protect Americans' constitutional liberties,” Udall’s spokesman Mike Saccone said in an email. 

An early draft of the complaint against an NSA program initially included both Udall and Paul as plaintiffs, according to The Washington Post

The complaint challenged the constitutionality of a National Security Agency surveillance program that collects metadata, including call times, durations and phone numbers, on millions of U.S. citizens.

Udall is not cited on the final complaint, which was filed in the Washington, D.C., district court on Wednesday. 

Udall, a member of the Intelligence Committee, has been one of the strongest critics against the NSA program. 

Last year, Udall teamed with Paul and a number of other senators to introduce a bill that would rein in the bulk collection of phone metadata among other reforms.

The conservative group FreedomWorks is cited as a plaintiff in lieu of Udall in the final version.  

President Obama is also cited as a defendant on the lawsuit. The initial version did not include Obama. However, it included Attorney General Eric Holder and Defense Secretary Chuck Hagel, who were both removed from the final draft. 

The Post obtained a draft version of the complaint after the ex-wife of a lawyer helping on the case claimed the lawyer did not receive full payment or credit. The lawyer, Bruce Fein, later said his ex-wife was not speaking for him. 

— Updated 11:29 a.m.